跨度为8m的预制梁脱模起吊时混凝土强度允许值应达到（）
A.40%
B.50%
C.65%
D.75%
参考答案：D
—How do you get to the city?—I _____ a plane to get there.[ ]
A. take
B. by
C. have
接题40，则投资者到期获得的收益率约为( )。
A．10%
B．12%
C．12.94%
D．13.9%
